Rabble-arm.



C. H. REPAT'H.

RABBLEv ABM.

ArPLIoATIoN FILED un 1, 1009.

Patented Aug. 31, 1909.

"al/NVENTOR.

Chares HHepathl .f L I ATTORNEY.

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f mnnzw. s. emma co.. ruomurhnnmm can sfraras P Agnnfr leine CHARLES I-I. REPATH, 0F SALT LAKE CITY,v UTAH, ASSIGNOR TO FRANK KLEPETKO, 0F NEW YORK, N. Y.

- RABBLE-ARM.

Specification of Letters Patent.

Application led May 1, 1909.

To all whom it may concern:

Be it known that I, CHARLEs H. REPATH, citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Babble-Arms, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in rabble arms for furnaces and it consists in the novel construction of arm more fully set forth in the specification and pointed out in the claims.

In the drawings, Figure 1 shows the dotted outline of a conventional form of McDougall or roasting furnace, with a vertical sectional view of one form of my invention; Fig. 2 is an enlarged middle vertical section of one form of rabble arm and a portion of the hollow shaft to which it is coupled; Fig. 3 is a vertical transverse section on line 3-3 of Fig. 2; Fig. 4 is a section similar to Fig. 3 showing a modified form of groove and tongue connection between the rabble arm and rake; and Figs. 5 and 6 are cross sections of a modified form of rabble arm .showing two dierent forms of tongue and groove connection with the rakes.

The resent improvement while designed particu arly in connection with roasting furnaces of the McDougall type, may of course be utilized as a feature in any stirring or rabble apparatus where necessity arises for keeping such apparatus cool, or at a temperature sufficiently reduced to escape the destructive effects of too great a heat.

The object of the invention is to provide an arm which, while it shall offer the best facilities for the circulation of the cooling medium, shall at the same time provide means for readily attaching or detaching the rakes or rabbles by which the stirring of the material or ore is accomplished.

A further object is to provide a construction which will effectively prevent access of the lfurnace dust to the joints between the arm and rakes, thereby avoiding the consequent cementing of the rakes to the arm. This leaves the rakes in condition for ready Withdrawal or removal from the arm in the event a rake becomes broken and its complete removal becomes necessary for the substitution of a new rake. Y

The advantages of the invention will be best a parent from a detailed description thereo which is as follows:

Referring to the drawings, and for the present to Figs. 1 to 4 inclusive, in which is shown one application of my improvement, F represents a roasting furnace of the Mc- Dougall type, shown in dotted outline. The hearths of the furnace are represented by h, the material or charge dro ping from one hearth to the next hearth be ow as well understood in the art. Passing through the several hearths is the rotatable hollow rabbleshaft 1, from which radiate the series of rabble arms 2, extending into the several hearths and carrying rakes 3, by which the material is successively fed from one hearth to the hearth immediately beneath it, all as fully understood in the art.

Into the hollow shaft is inserted a waterfeed pipe 4, which discharges into the bottom of the shaft whence the water circulates through the series of arms and upward through the shaft as follows: Each arm is cast about an open ended circulating distributing pipe comprising an outflowing substantially horizontal branch a, a terminal elbow b and an inliowing or return branch c discharging into the shaft, the branch a taking the water from the shaft. lThe branch c is inclined inwardly and upwardly so as to facilitate the ,circulation of the water, the cooler water seeking the horizontal branch a and iiowing outwardly, and the hotter particles flowing upwardly and inwardly toward the common rising current in the shaft and around the feed-pipe 4. The disposition of the branches a, c, dispenses with the necessity of leading a distributing pipe directly from the feed-pi e as is common in many systems of circu ation in this class of furnaces, the inclined position of the branch c serving to induce proper circulation in the arm without resorting to the expediency of a special distributing pipe coupled to the feedpi e. By thus casting the rabble arm 2 so id as shown (in lieu of a hollow arm as is frequently used) it may be made lighter and of comparatively reduced cross-section, the

bulk of the metal being placed along the bottom where it serves to support the rakesor rabbles 3. rlhis distribution of the metal gives to the arm an enlarged laterally eX- tended base, along the central ,portion of,l which` is preferably formed a dove-tailgroove, running the full length ofthe arm and open at the outer end. Into this groove are insertedV the correspondingly shaped tongues t projecting from 'the flat lupper heads 7L of the rakes, the heads h bearing against the under surface or `latbottom of the rabble arm. rlhe dove-tail cross-section such as 2 lshown in the modification in Figs.

rake could ori 5'and 6, whereinboth forms to tongue t and t for the rake are illustrated.

The construction of arm and 4its rake as here described brings the securingtongue t (1," of thefrale close to the cooling circulating medium whether confined'inthe pipes a c t, ori'nthe'hollow arm 2f, thetongue beingthus interposed betweenthe means forv circulating the cooling medium and the rake proper. Thisnot only Lcools but protects theftongue; and in that'protected'position-thetongue is practically incased within the 'body of the rabble arm so that no dust or line ore particles canaccumulate in the joints between the tongueand the groove which receives it, and thus the danger of the dust cementing the rake to the arm is eliminated. The rake is thus ever free to'beshifted along'the groove, and should a rakelbreak at any point along Vthe length of the arm, thoseiirfront of itmay be withdrawn from the outer end ofthearm, thenthe broken rake maybe removed in the same way, and a :new yrake inserted. rEhe y ginally'be cast with 'an opening of a-size indicated bythe dotted line-o, and should a rake stick it could be p'ried` oilby inserting a lever or bar through the opening thus formed, when the prying off of the rake cou'ld be vaccomplished without noticeable injury tothe ribs constituting the sides of the grooveformedin therabble arm. Toprevent the outer'rale of the vseries from working out ofthe groove, it' may beloclred or secured to the arm-by any means wellknown in the art, such detail being of no consequencein the present'eonnection.

Itwill be seen from the foregoing'thatthe rakes strung along the arm. Vaccumulate in the joints between the tongues yandthe -walls of the grooves in which they groove for receiving the tongues of the rakes is foi-med in the center of the main body of the arm and above the bottom thereof, the enlarged bearing head h of the rake resting against the-flat bottom of the arm, the heads extending on either side of the blade of the rake so as to properly space the series of No dust can are inserted, and the danger of a rake becoming cemented to the arm is reduced to a minimum. Of course, the heads 7L overlapping as they do, the joints formed between the bottoms of the tongues and grooves and bearing against the bottoms of the arms prevent anydust'reaching such joints.

Having described my invention what I claim is:

1. A rabble arm'having an expanded base and a reduced upper portion, an outward circulating passageeway disposed along the bottom, and a return passage way leading therefrom and inclined upwardly and inwardly toward the inner end of thearm, the arm being provided with a'groove between'the l; ottom face of the arm and the outward'circulating passage-way, and rakes` having tongues inserted in said groove, and heads overlapping the sides 'of the groove and v'bearing against the bottom of the arm.

2.* A rabble arm having an expanded base provided with a "iiat bottom, and having a reduced'upper portion, an outward circulat ing pipe ineased within the arm and disposed adjacent'to the bottom, an inwardly and up Wardly inclined return circulating branch incased `within the arm, the arm leing provided with `a groove between the bottom face olf-the arm andthe outward circulating pipe, and rakeslhaving tongues insertedinto said groovefrom the outerend of each arm, and heads overlapping the sides of the groove and bearing against lthe'bottom of the arm. K 3. A 'rabble arm provided with/means for circulatinga cooling medium therethrough, and having `a longitudinal groove disposed along the bottom and between the sides'of the arm, 'and rakes having tongues inserted in said groove and formations adjacent to the tongues overlapping the Vjoints between the tongues and groove and bearing against the bottom of the arm.

1In testimony whereof I alix my signature, inpresence of two witnesses.

f CHARLES H. REPATH.

FRED RITTER, A. G. "MoGnneon, 

